Fixed video, kbd and buzzer

cpu/bus/data_pins_lattice.v

@@ -0,0 +1,39 @@
+// Use this file with Lattice toolset instead of data_pins.v
+//
+// This file is provided courtesy by JuanS
+
+module data_pins(
+    bus_db_pin_oe,
+    bus_db_pin_re,
+    ctl_bus_db_we,
+    clk,
+    ctl_bus_db_oe,
+    D,
+    db
+);
+
+input wire bus_db_pin_oe;
+input wire bus_db_pin_re;
+input wire ctl_bus_db_we;
+input wire clk;
+input wire ctl_bus_db_oe;
+inout wire [7:0] D;
+inout wire [7:0] db;
+
+reg [7:0] dout;
+
+always@(negedge clk)
+begin
+    if (ctl_bus_db_we | bus_db_pin_re)
+    begin
+        if (bus_db_pin_re)
+        dout <= D;
+    else if (ctl_bus_db_we)
+        dout <= db;
+    end
+end
+
+assign db = ctl_bus_db_oe ? dout : 8'hZ;
+assign D = bus_db_pin_oe ? dout : 8'hZ;
+
+endmodule